Is This Worth It?

My grandfather has a '97 Lexus ES300 with 72,000 miles on it. It needs $1600 worth of work done to it. After the work done, the car will drive well. He has been the only owner and it has a clean history. He would sell it to me and I would put in the money for the repairs. I don't know what to do. Is it worth it to put more money into this car than it is worth?